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Bicycle derailleur with a chain guide disposed at an upper portion of a link mechanism

a technology of link mechanism and derailleur, which is applied in the field of bicycles, can solve the problems of rear derailleur being damaged, and rear derailleur being affected

Inactive Publication Date: 2006-10-24
SHIMANO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a new feature for a derailleur, which is a gear system for bicycles. The invention includes a base member that is attached to the bicycle frame, a link mechanism that has two parts, and a chain guide that moves relative to the base member to shift between different gears. This new feature helps to make shifting smoother and more efficient for bicyclists.

Problems solved by technology

When a conventional derailleur is mounted on a small-wheeled bicycle, there is a risk that the rear derailleur may come into contact with the road surface when the bicycle is inclined either when the bicycle is stopped or during riding.
While this does not pose a problem in terms of rear derailleur function, the surface of the rear derailleur may become damaged and the appearance of the rear derailleur suffers.

Method used

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  • Bicycle derailleur with a chain guide disposed at an upper portion of a link mechanism
  • Bicycle derailleur with a chain guide disposed at an upper portion of a link mechanism
  • Bicycle derailleur with a chain guide disposed at an upper portion of a link mechanism

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Experimental program
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second embodiment

[0019]FIG. 4 is a side view of another embodiment of a rear derailleur 11a. Rear derailleur 11a is mounted on the back end of frame body 2, and it comprises a base member 26a, a four-point link mechanism 27a disposed on base member 26a, and a chain guide 28a disposed on the four-point link mechanism 27a. In this second embodiment, the elements other than the base member 26a are identical to those in the preceding embodiment, so they will not be described here.

[0020]As shown in FIGS. 4 and 5, base member 26a is fastened to the back end of frame body 2 independently of hub axle 40. More specifically, the back end of the frame body 2 that mates with the hub axle 40 projects downwardly to form a derailleur support member 54 with a fastener opening 55. The upper portion of base member 26a includes a fastener opening 58 and a projection 61, wherein projection 61 mates with a notch 60 formed in the lower edge of the derailleur support member 54. Base member 26a is secured to derailleur sup...

first embodiment

[0023]In the first embodiment described above, a convex projection 50 on the upper portion of base member 26 is mated with a concave slit 51 provided at the back end of frame body 2. However, the connecting structure for the frame body and the base member may take any form, provided that the rear derailleur can be non-rotatably secured to the frame body without chatter.

[0024]In the second embodiment described above, a projection 61 projecting from base member 26a is mated with a notch 60 formed in a derailleur support member 54. However, the connecting structure for the frame body and the base member may take any form, provided that the rear derailleur can be non-rotatably detained and easily removed from and reattached to the frame body.

[0025]The size, shape, location or orientation of the various components may be changed as desired. Components that are shown directly connected or contacting each other may have intermediate structures disposed between them. The functions of one el...

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Abstract

A bicycle derailleur comprises a base member structured to be mounted to a bicycle frame; a link mechanism having a first portion and a second portion, wherein the first portion of the link mechanism is coupled to the base member, and wherein the second portion of the link mechanism is disposed above the first portion of the link mechanism; and a chain guide coupled to the second portion of the link mechanism so that the chain guide moves relative to the base member to move a chain among a plurality of sprockets.

Description

BACKGROUND OF INVENTION[0001]The present invention is directed to bicycles and, more particularly, to a derailleur used to shift a chain among a plurality of sprockets.[0002]Bicycles are used both for general transportation as well as many recreational activities. Sometimes the bicycle is transported to locations away from home before being ridden. As a result, in recent years bicycles have been developed to make them more compact to facilitate transportation and ease of use, for example, but without losing functionality expected of bicycles. This includes the development of bicycles that have smaller wheels than those found on conventional bicycles.[0003]Many bicycles currently available have multiple speed transmissions that allow the rider to select gear ratios to accommodate changes in running conditions. Such transmissions sometimes include a derailleur for transferring a chain among a plurality of sprockets. For example, a rear derailleur may be detachably fixed to the back en...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F16H9/00B62M9/12B62M9/121B62M9/124B62M9/1242B62M9/126B62M9/16
CPCB62M9/1242B62M9/16B62M9/125
Inventor SHAHANA, SATOSHI
Owner SHIMANO INC